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| Description: auxin 5. 3 au auxin auxin W B C A Influx carriers (blue) actively transport auxin into the cell; efflux carriers (red) actively transport it out. Efflux carriers positioned asymmetrically in the membranes direct the flow of auxin in a particular direction. B Efflux carriers cells in a lengthening shoot tip direct auxin downward through the stem. C Auxin enters a root tip in vascular tissue. Efflux carriers direct its flow through epider— mal cells in the root tip.
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